Correcting Image Distortion; To Use The Crop And Straighten Photos Command; The Lens Correction Filter - Adobe PHOTOSHOP CS2 User Manual

Important: You must select an object that was rectangular in the original scene or Photoshop will not be able to
transform the perspective in the image.
Select Perspective in the options bar, and set the other options as desired.
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4 Move the corner handles of the cropping marquee to match the object's edges. This defines the perspective in the
image, so it is important to precisely match the object's edges.
Drag the side handles to extend the cropping bounds while preserving the perspective.
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Note: Do not move the center point of the cropping marquee. The center point needs to be in its original position in order
to perform perspective correction.
Do one of the following:
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Press Enter (Windows) or Return (Mac OS), click the Commit button
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the cropping marquee.
• To cancel the cropping operation, press Esc or click the Cancel button
If Photoshop displays an error, it is probably due to improper placement of the corner handles or center point. Click
Cancel to go back and adjust the cropping marquee; click Don't Crop to cancel the cropping operation. An error may
also occur if you're working with a previously cropped image.

To use the Crop And Straighten Photos command

The Crop and Straighten Photos command helps you make separate image files from multiple images in a single scan.
For best results, you should keep 1/8 inch between the images in your scan, and the background (typically the
scanner bed) should be a uniform color with little noise. The Crop and Straighten Photos command works best on
images with clearly delineated outlines.
If the Crop And Straighten Photos command cannot process a complex image file, use the Crop tool.
Open the scanned file that contains the images you want to separate.
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2 Select the layer that contains the images. Alternatively, draw a selection border around one or more images to
generate just those images into separate files.
Choose File > Automate > Crop And Straighten Photos. The scanned images are processed, and then each image
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opens in its own window.
If the Crop And Straighten Photos command incorrectly splits one of your images, make a selection border around
the image and some background, and then hold down Alt (Windows) or Option (Mac OS) when you choose the
command. The modifier key indicates only one image should be separated from the background.

Correcting image distortion

The Lens Correction filter

The Lens Correction filter fixes common lens flaws such as barrel and pincushion distortion, vignetting, and
chromatic aberration.
Barrel distortion is a lens defect that causes straight lines to bow out toward the edges of the image. Pincushion
distortion is the opposite effect, where straight lines bend inward.
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in the options bar, or double-click inside
in the options bar.
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